> On 2 Feb 2018, at 19:07, Richard Mortier <richard.mort...@cl.cam.ac.uk> wrote:
> On 02/02/2018 18:17, Mindy Preston wrote:
>> On 02/02/18 06:32, JIM Yuan wrote:
>>> Hi,
>>> I installed Xen on Ubuntu 16.04 Server, which runs as a VM in VirtualBox 
>>> 5.2.6 on macOS.
>> I think nested virtualization (running Xen within another hypervisor) is not 
>> very well supported (perhaps someone more familiar with the current state of 
>> nested virt in Xen can comment more?), and I'm not surprised that there are 
>> problems with a unikernel that tries to use network resources there.  I 
>> would recommend trying with a hypervisor running directly on hardware, not 
>> virtualized itself.
> FWIW that used to work, at least for me. I will admit to not having done it 
> recently though, so perhaps somewhere in changes to OSX, Virtualbox, Xen and 
> Mirage over the last year or two, things have changed.

Indeed — this doesn’t look like a nested virt crash to me, since it has 
attached to netfront and is crashing quite late in boot.  I’ll see if I can 
reproduce it later, as I’m suspicious that this might be due to a change 
somewhere in newer Xen device models.  It’s hard to tell without a gdb 
backtrace for sure where it’s crashing.

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